16gb ram installed but bios shows only 8bg

Solution
Any new hardware or changes? Particularly CPU cooler? Try pulling and reseating the DRAM - if no joy tell us DRAM model #, CPU and mobo and we can try an adjustment or two

Krzysztof_7

Commendable
Jul 20, 2016
3
0
1,510


64bit, yeah both working individuallly

3 weeks ago both sticks working and i had 15gb usable ram,,, i dont know what happen, now i have 8gb
 
You didn't say what MB you have. The chipset might not support the modules you're using. For example it might work with 4x4GB but not 2x8GB becuase the modules are too big. Check your owners manual for approved memory configurations. Do you have the latest BIOS for your computer? Memory support often gets updated there.
Tell us your MB, and memory module size and type.